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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f57208df832cc7f3cf38c815905d460639538c41bcf2c4c6576562343a53bc4a' 
  AND token = '4fMVtLMOPTbTkyfqJ4sSJsaXQx3rqo9QxxBxpThW9LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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