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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5e40f5bb32796a1e3396726a2592d1a39f3be4a728e5d7c55002e41063ce7f1' 
  AND token = '2zLGnBXajyzNOVVMkjuWriy7M9MW1MtsETseBk1ubCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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