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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33c8a2a59b04f8b002eb01647b0bec28218d422b07550dc96e62597af0c386ed' 
  AND token = 'oNNZAW4Fv97BFBrla8EMoTjshVH53QMFra8m+6foauc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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