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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '018ac19659b800ba486d7baff78e7b8780d3ee06332bb0aa92efd50a9111064a' 
  AND token = '6GOA5GErev2b8h8SFb51W+lW/xXX9AORj3K+AaOQru0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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