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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa42488dbd9cec1ddb16eef27360d05433ee53287df9e35ba2064de782afdd5f' 
  AND token = 'oauZEjW+AA8kgwdSb6oC1/Sy/3H0gL9d50CL7l9kA0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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