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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d4b2d3d78def4fbeccc1cfd848a2ea89444e479408692935d5066c65c67d185' 
  AND token = '3TWEF6Mm+LG8fDQr73EMReNsjXg69ErJB0sI1dhjycQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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