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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6767d0e7a21e39752fa7dae431d655f1de09180718f3fb5c4fec9d527354f0af' 
  AND token = '+x7YUYmCaIZjc8Po68B7tA99edeNoqQw1bHWYYSnKko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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