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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9c6a9526fd510b6b35f3f6b20201b94499d21ac12dcfa1caf0ff6b6dcf6cf55' 
  AND token = 'VfMw3u6KxaWE+hDmY1rBN11PH1xw5xkaYEMc7+t8R84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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