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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be2bda99573f75f6a5e636bbe2538ef3fa32454b73a546f57ebe2ce883f9319a' 
  AND token = 'QA8xn+H+2TVauTeduamIsFpP/D+fVkW6HY8POO0mxVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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