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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '677867285c4a9389b5b30bc12e17e7052c03d1483a8ee06d132078c0cf014eba' 
  AND token = 'QmAVvvR0fjqjF6JQpxOLuMh1fOjtzFv0u4Ek1/ddZ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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