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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '001b1b9772a2a55519ab038d6024364e378b0eb58f0eeb00bd7d5376d9bf7f9c' 
  AND token = '6WNQ9zxO6m1Lg1+w5E89dGHeOi4l6kp27ePiFQEJKQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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