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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6a4615690fbd951ecd8516351130c9cf9ccab2936d880ee8ac4d40e3738d631' 
  AND token = 'NVCx0K1U5WSol9NN0jvbj8SjGHQYdGQ3WEUKsHv7ol8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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