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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a50b06372cd6e52d1262b12d2e193ed93c190bbea687f10c3e42f10f820b4516' 
  AND token = 'hY97o4xlCxunx4vc+5ER9QpReVW0cDoudIHUNGlLFPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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