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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8dc4f69a6267a1662acb06250b07926b692148118670dcfef1dacd7db514c6f' 
  AND token = 'BLhPrUqHCSmt20/U0I/TEFgZdAvQCsAVQfe3T0e7Xnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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