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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88c34a049987aef8c2968555c30b4a162e323fb7aa2a332e499d503987eaa33b' 
  AND token = '56smEDY72u1IZyqg1GU0F3WngHRuyJuzjjTuq40bQrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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