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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f46654138483b49694b58e51a5ad292735547009eac7cf8cadfee488418f5bd' 
  AND token = '1+w0OSdVxHwd6b1SnaYb6rvD892/Iv6z0npVeMjfUBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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