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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '075d5f91a3cea1735e848bdcf07ca8b83c0e0e67e48fd83f5ad71e94eba874e1' 
  AND token = 'cVZcM0omdFQohSxAPzodJ0YHJhBUFO5nwWhu4yp5GWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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