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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37ed03b52fe9b7cf8cb1f7d57b7c91945960c78d0811c3902a113f1548d26a0e' 
  AND token = 'pPtRu49QXgY4BJrTLgEQWRnh7IQO2oDYvEPiFfW8Uik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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