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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92545185b8414ea18aa3e3ba37a5ac8d862fe97dc0ac4961ea0cfa311f1a963d' 
  AND token = 'bdle08Cm++lkOYXdTjZkr17efu60NxhrBzHEeOKahzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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