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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbba4d1a7e8f8109f0a764fd7edfc08adfc0dcb0c47689e7bd8c653dae3cb7ea' 
  AND token = '30z3kXwLdZmucDN8iEBDjeGps/iws4WIFD1CCId8K0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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