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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca7e48f2db2146d3ccf25b50cb983b523ec3e891cb70de5373f61827c62fd031' 
  AND token = 'vg7NHsHYvcs0Tk2fLWWbEspkKixviHFJKB3aH3h4VjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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