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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8128b8eb5b72081ed129eda415d2b4a707a803f884a4ee7385cd9f5393704f57' 
  AND token = 'kojghYXseR8lj5GzFtWzIWwHvM1JpTit3kcmNblzF5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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