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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc082a5516e99fef85636d71971f12cc78f01995002ae216bcc2e81de8014e12' 
  AND token = 'wp2C35XblHv8RVfNbxhbjaAPDwKhFdv9sSMfrwagw2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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