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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79ef3604eff212b3415628482f76b4c1a5eaf6d4c5e634765a921f8a6549b395' 
  AND token = 'ygqLx30m/U8D6oJVUs/Xa0Nksq6R09rI221w2f+XRfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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