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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88c1d1224119e230166d1e101a5b04e266e22b72e88908369053f146a948b813' 
  AND token = '2ztSCTnsUibFHQ1utabcvI09T6m3Re60dlfYFaKuOB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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