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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af11303ec4bb16c1225763e9639806a77f2bd1bc93d3678d02fadeb0e38526ab' 
  AND token = 'DiCe2QPdvXplNvsgVmSIAWao59t1C/VRWk4bHUPAyok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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