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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '670232c3c892ac7577a8d6ece7150cfe78a36c8778b3379d4339cc3a20ecc5fb' 
  AND token = 'I3VzsVgW+IpaAuLcCakgvuRXsGH6zx8Bv232WAt1MnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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