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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eeedb1475f3818232c0eb324b31429782a717c4863f7268d7bb49c89c356ba55' 
  AND token = 'v8e3nMVz710wmg/V4WQUvI3IASatmauqqoRXa5aVWkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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