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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6ad3e5d89fa04905a21d37a24bf856f0d25a53802286f99e391873df4659a1d' 
  AND token = '5PIfMO4VsMFtMmHdoC/q5yfL57ZeJ4hc/1XKN+Dcbwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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