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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c343c60036e41b8b0c92c7a5b6894706295f6b369ca13b7206943181875f367e' 
  AND token = 'bQM8XogIg5I7rVDVDN9Zsf1/FV0Ei0GmBUNLADFuPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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