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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f530086057ec1d0432a23a4df9ce7111a9f140ba60abf6c84832a6d706d461e' 
  AND token = 't4iWlFX4ohxDWzLAJjRILdSUiXRKaIgg6xxpYpRadXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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