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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f204dcfaa50c0275a4c4ece33ff4e9f0a8230b9b13b26b798792720c0d1f937' 
  AND token = 'M4sR9Xi2g/r14EtFbJQzs0eebQGkd5ZD68u/0nDsxmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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