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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d4b2a24c3e1b2212f7d586c4365c4b62d2b5c4e114a49a8f101b9c444dd47f4' 
  AND token = 'QN1hxALOpBrdLtsuIIWZBtFIA+3vmXCxDsoj9ORCQkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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