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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e293958fe843d3369499c102c4e13f110cef14f2ed85846eb8dbfa2bc36817b' 
  AND token = 'Z29eyzZ+tfmdKpowO+hcNb1BGGE4abCeBgHRzGD1K3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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