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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dc980ef1b9f3d3ba52f48c88d99c23c1ba6bca39e1f8b610c3e2fb8974ec462' 
  AND token = 'CzPvpuodladjKTPBDPvC34M2oVwMxMV8u4fi5bGKqMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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