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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a92273de06347e9e0ea16085454093052b9baf408a0fe15a73299509b8198d26' 
  AND token = '1obAyZX5AphPHAkrW8M5pHbU4mpQys1t5O4ydya4b9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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