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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473cca9b191ee2e980cbb79cac76e326afb349f1e32a512598b125856545d7ec' 
  AND token = 'L1PRr8VaHzpuxi8TnxjwTjYB4uDHKf3Trpk9TyHA8lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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