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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cacb018b33ad6e3ea92a347d9873becf93cd546eb6104f544c357f995b1bbf5d' 
  AND token = 'RH9h5omj8F+MyYT9+Se6+CEcpzRz77DNKLLeaFc2do0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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