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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f706e3e6b48acf31061917f1242e4cc74bef937dadd86bded0903a0e86dcc39' 
  AND token = 'sN/uoJZcL0jtAIGjRUTrGusMOSNn7akTJfEkXktv+d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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