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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcc20877c12ae3a0f75c9a9bb7712ff534386787c4bbcfc63701a859115c3a79' 
  AND token = 'eLeSSj8pHRFObuZg+B/X4DjBf01o3ejdpItE+6idDOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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