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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4160ea9e382eebeaf3d81e72925d59333a0078d661cf0784599edd6f77db344e' 
  AND token = 'xRSSrWRVj8w0cj7VbaSWs4vuwK+OMjgK8o5W62GX2MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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