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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da26617322c245c245348d1529f3dbcf768306615b2dfdcf517e4191fb54425f' 
  AND token = 'yz9Wk11HlSnYNI+0WST6AVxXOPvtFA2NjtWs6X+yRMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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