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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8765bde958a0bd10ad5598f0b9a9d2f5f223a4df710dca48667fdd54fc99cfaf' 
  AND token = 'LmtGHWTk/kK1wT5Y736uD8Vm9mY8dgFFFZ0lOpkI+yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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