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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c62cadb11ffd29f53d93187a5bc5297d51ad59ff9735c8a98ba63f9ebf89b183' 
  AND token = 'VP/y0od4xpSUbnBcmmNHg0Fv7U/Qfawkk34d7Zq6q1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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