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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08232c4644f7ed340862a9c73e240fd88549471ce4e96c8d8ee26c851a0272fe' 
  AND token = 'BSaDdYyBUmgWHhVMQAyTAvYKp67rBgw+aBCqrOA7sU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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