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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd184f5bb58e968b79ce0b3abaa7ce1691e31a666a28cc24aed71daca3ffea3eb' 
  AND token = 'grsQgrirY9P3qstLxaMIjzbKgVrcZ4AZ052I2qbZJ6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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