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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5135b3101a5271063e9bb77217b6bfc4f17ea78e9664591e4d2948a4d71590da' 
  AND token = 'YyKOsNX33sYnIUeysEXipe+cCxHhnBkloB+Vm+OccGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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