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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6e71347003c2e06521287509b1b38dcd76c0d0d45a4469145d753100d67eaac' 
  AND token = 'YSM/a98Zjx4612pfVOH1rB1RvZB3BWoATzmW6+pXiQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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