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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '048479389523b8c50311287d82481fdcfe38da4874de6366f124a6d7295395f6' 
  AND token = 'SF8y5uekpfmeJ5CX0Dlu2XhOWX05UD3MQEdn2oKhlI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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