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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7cbd907553d7d7e5d634eee66d7211b6aa08493c608f70b467c1cc8cfe3ff5' 
  AND token = 'dupPMSh/m4U6B82Ag7q9BpBELul7VdHL/+jS9ykoDsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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