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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c468bbbe3ce0f76862b5d806051c58760b59962ec47eac7ef3e2015ff06f8079' 
  AND token = '5KaeXmjrDm40PXXfjDsEhoK0HwBKUKZMJ6EI+fKBPlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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