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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94e72e2d26fb21abb9dddbd97be5646a477c690c115e0371b76c621eb04e9cad' 
  AND token = 'zb+mkubJcwK08dYf4AY1PB8oa4KHibQj7sYvoT0Bmgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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