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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afc1bade219a23acc1332564c5e9e939bd3eb45a5863ec632c84f1594401a5b5' 
  AND token = '4bMx6+aQJZPCKKqbyntbQQQV4UCUsnR7GqT52f9NzwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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