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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f89412b84efd9e1b8cc3804af5b2a419b0d7468577fb8afbd86860b19fcf6fe5' 
  AND token = 'q4DF4WvXSa/Nm69cAa3ahdltcNyKN6i2/pgTJydX5r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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