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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa7ce768401eb40bfbbf7e864072d02adee74a8ada670b47caf0b83061580137' 
  AND token = 'WhHHo6ZZY6D/BOytJf6nG5NOuQ+SzNawOhXDhiFeb0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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