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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '926a329325cfadc3b353935a21f737754cd7c335767df74e6992f295747e86f9' 
  AND token = 'D0KUCrjF90KU3Hg3Akk4mXQvVeql5o5JvrXiklMv1nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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