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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41560f6f0d5d11a182c306561ef9f772b83171f8a343c78e6a56227c11ceadce' 
  AND token = 'TZzgN3s6WG8YqFn492ATccvXI2YNo56cQDgtLOSt8b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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