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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d9f8237dce557a075a05ba862866dbcbf7cd24a39fe6516b7eb1cc922e0b306' 
  AND token = 'Bk1mqTGXQDm2XcNy4gHSbJ95y//FXHuUNcLAMWMDsqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}