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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aad13a8f9cd8e3b1f50c63f7e987e8c1ad878003c463e8e535292dbafaf3855e' 
  AND token = 'kV5X6QTH955avbG6s4y+6itnVoXyESo301j936XHuEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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