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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80afd205c2f5b45e88d8cd00d42b46c9cc99334fe0157751b8f418717964bb5f' 
  AND token = 'n3OVOo9S4Hf9GCppzUg0i1544HnqUtcpACyI/9nJlKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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