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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2efeb08da4b1745d92f8f15b786900417faf482378685f3d60597772fd04f88' 
  AND token = '39Pzb+4KIXhRx7agxyOWSWI5nynn0QTZ1smJMCp6igI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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