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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '426cb17f4989687e1e420044f5f774df5dfaa8ffb4a07d4d7753900320cdf336' 
  AND token = 's16enQR6HFAYltXP2Q5irYDpwdHWoY8+RNW0jCQX8sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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