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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea2d2b861cc3946a5c87215056e093d0d9acd25e9122f37c31b278ce3117391' 
  AND token = '46AAnGEF4f0m0MnS3yu02vwckcUuIH/ejipP49g6AX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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