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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b35a6a42da34abd23bbd87ea6c7f9903282ddd250d1343c4134b84cd947ba2ae' 
  AND token = 'BIIvqGpqzRX1GVrxqVvlazuIZH0QlBe29SZaM2Tptqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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